Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer

The variability of raindrop size distribution (RSD) and integral rainfall parameters (IRPs) over Metro Manila during the Northeast Monsoon (NEM) (October 2018 – February 2019), Pre-Southwest Monsoon (Pre-SWM) (March 2019 – May 2019), and Southwest Monsoon (SWM) (June 2019 – October 2019) seasons are...

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Main Author: Ibañez, Marco Polo
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Published: Archīum Ateneo 2020
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Online Access:https://archium.ateneo.edu/theses-dissertations/389
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spelling ph-ateneo-arc.theses-dissertations-15152021-11-08T03:39:10Z Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer Ibañez, Marco Polo The variability of raindrop size distribution (RSD) and integral rainfall parameters (IRPs) over Metro Manila during the Northeast Monsoon (NEM) (October 2018 – February 2019), Pre-Southwest Monsoon (Pre-SWM) (March 2019 – May 2019), and Southwest Monsoon (SWM) (June 2019 – October 2019) seasons are studied by using one year of PARSIVEL2 Disdrometer data. Soundings, satellite, and reanalysis data sets are also used to determine the possible dynamic and microphysical processes that affect the RSD during the three different seasons. Results show that the NEM has the highest number concentration of small raindrops (D < 1 mm), while SWM season rainfall has more significant quantities of large raindrops (D ≥ 3 mm) among the three seasons. The SWM convective rainfall (RI ≥ 10 mm hr-1 ) has the highest values of rain intensity (RI), mean raindrop diameter (Dm), reflectivity factor (Z), and liquid water content (LWC) while the NEM convective rainfall has the highest value of normalized intercept parameter (Log10(Nw)). This result means that the high number concentration of (small) large raindrops during the (NEM) SWM season is due to the (low) high frequency of occurrence of convective rainfall. The SWM season has the highest values of Convective available potential energy (CAPE), which extends clouds further above the freezing layer (~ 5 km), resulting in cold-rain processes that promote aggregation and riming of ice particles and produces large raindrops at the surface. This work is the first rainfall microphysics study in the Philippines that is based on actual RSD measurements. The results obtained from this study will provide a physical basis for improving rainfall retrieval for weather radars and the parameterization of microphysics schemes in numerical weather prediction models. 2020-01-01T08:00:00Z text https://archium.ateneo.edu/theses-dissertations/389 Theses and Dissertations (All) Archīum Ateneo n/a
institution Ateneo De Manila University
building Ateneo De Manila University Library
continent Asia
country Philippines
Philippines
content_provider Ateneo De Manila University Library
collection archium.Ateneo Institutional Repository
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Ibañez, Marco Polo
Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer
description The variability of raindrop size distribution (RSD) and integral rainfall parameters (IRPs) over Metro Manila during the Northeast Monsoon (NEM) (October 2018 – February 2019), Pre-Southwest Monsoon (Pre-SWM) (March 2019 – May 2019), and Southwest Monsoon (SWM) (June 2019 – October 2019) seasons are studied by using one year of PARSIVEL2 Disdrometer data. Soundings, satellite, and reanalysis data sets are also used to determine the possible dynamic and microphysical processes that affect the RSD during the three different seasons. Results show that the NEM has the highest number concentration of small raindrops (D < 1 mm), while SWM season rainfall has more significant quantities of large raindrops (D ≥ 3 mm) among the three seasons. The SWM convective rainfall (RI ≥ 10 mm hr-1 ) has the highest values of rain intensity (RI), mean raindrop diameter (Dm), reflectivity factor (Z), and liquid water content (LWC) while the NEM convective rainfall has the highest value of normalized intercept parameter (Log10(Nw)). This result means that the high number concentration of (small) large raindrops during the (NEM) SWM season is due to the (low) high frequency of occurrence of convective rainfall. The SWM season has the highest values of Convective available potential energy (CAPE), which extends clouds further above the freezing layer (~ 5 km), resulting in cold-rain processes that promote aggregation and riming of ice particles and produces large raindrops at the surface. This work is the first rainfall microphysics study in the Philippines that is based on actual RSD measurements. The results obtained from this study will provide a physical basis for improving rainfall retrieval for weather radars and the parameterization of microphysics schemes in numerical weather prediction models.
format text
author Ibañez, Marco Polo
author_facet Ibañez, Marco Polo
author_sort Ibañez, Marco Polo
title Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer
title_short Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer
title_full Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer
title_fullStr Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer
title_full_unstemmed Investigation of the Monsoonal Variation of Surface Microphysical Characteristics of Rainfall over Metro Manila Using A PARSIVEL2 Disdrometer
title_sort investigation of the monsoonal variation of surface microphysical characteristics of rainfall over metro manila using a parsivel2 disdrometer
publisher Archīum Ateneo
publishDate 2020
url https://archium.ateneo.edu/theses-dissertations/389
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